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Unfortunately your car (according to its factory options) does not have suitable camera for speed limit information so it must be retrofitted. BMW part number 65 50 2 184 753 contains all hardware that is needed to do that (camera, control unit, cables, mountings, etc). FSC is needed additionaly which is part number 66 50 2 444 948. Total dealer price for both is about 325€ + VAT according to ETK. Local dealer here asks about 400€ + VAT for both.
The only problem which could arise is that car as you said is from Czech, but Czech is not listed along which can have this retrofit, but Poland is, so it may be possible to obtain that. There are no official option codes for Polish or Czech versions so I have no idea how dealer check that.